Railway-crossing



L. G. McKAM.

RAILWAY CROSSING.

APPLICATION FILED MAB-J1, 1920,.

mmas o- Emma. 29,1921.

lwwwtoz Law/woe G. M /(am LAWBIANCE G. EICKAIEE, OF DETROIT, MICHIGAN.

Specification of Letters Patent.

Patented Mar. 29, 31921.

Application filed March 11, 1920. Serial No. 384,884.

T 0 all whom it may concern.

Be it known that I, LAwRANon G. MOKAM, a citizen of the United States of America,

- residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Railway- Crossings, of which the following is a specification, reference being had therein to the accompanying drawings The invention relates to railway crossings of that type in which the intersecting portions of the rails are integral and are transversely grooved for the passage of the wheel flange. It is one of the objects of the invention to obtain a construction in which pounding of the wheels when crossing the grooves is prevented. Another feature of the invention is the means employed for joining the integral crossing portions with the rail sections, and the invention further comprises various specific features as hereinafter set forth.

In the drawings:

Figure 1 is a plan view of the crossing;

Fig. 2 is a perspective view of one of the crossing members; i

Fig. 3 is a longitudinal section on line 33 of Fig. 1;

Fig. 4: is a horizontal section showing the manner of joining the rail sections to the crossing section.

A and A are the rails of one track, and B and B are the rails of the intersecting track. 0 are rail chairs located at the points of intersection of the rails of the crossing tracks. These chairs are preferably formed of integral castings having transversely extending rail sections D and D with connecting fillets E and transversely extending grooves F and F for the passage of the wheel flanges. The grooves F and F are of such a depth as to engage the periphery of the wheel flange so as to take the load on the wheel while crossing the intersecting groove.

With certain constructions that have heretofore been employed the bottoms of the grooves of the chair have been curved upward to the point of intersection with the transverse groove, so that the wheels in crossing the joint are lifted to clear the tread portion from the top surface of the rail. This has the objection of forming a bump over which each wheel must pass, interfering with the smoothness of travel and requiring the overcoming of the inertia of the load in changing the direction of movement thereof. With my improved construction this defect is avoided by forming the bottoms of the grooves F and F substantially straight and of a depth to engage the wheel flanges without either raising or lowering the wheels. Inasmuch, however, as the passing of the tread portion of the wheel over the transverse groove will cause a pounding where any load is carried through the tread, T have depressed the portions of the rail on opposite sides of each groove. Thus, as shown in Fig. 3, the portions G are gradually inclined or curved downward toward the groove, so that when a wheel, such as H, is crossing the groove the entire load is carried upon the flange T. This will avoid any pounding and the gradual incline of the rail will permit of picking up the load upon the tread without any pounding.

The chairs G are connected to each other y rail sections J. These are secured in position by fish plates K and the construction is preferably such that the fish plates extend the entire length of the rail sections and overlap sections of the chair. These fish plates are then bolted through the web of the rail and the web of the chair, as indicated at L, and are secured to the track sections A and B in a similar manner.

The construction as described can be cheaply manufactured and more easily installed than constructions where the entire crossing is formed integral.

What I claim as my invention is:

1. A railway crossing, comprising chairs forming the intersections of the crossing rails, each of said chairs having transverse grooves therein for receiving the Wheel flange, the bottoms of said grooves being substantially straight and of a depth to contact with the periphery of the wheel flange when the tread of the wheel is resting upon the versely extending grooves therein for the reception of the wheel flange, the bottoms of said grooves being straight and of a depth to be tangent to the wheel flange when the tread of said wheel is resting upon the top of the rail, and the end portions of the top of the rail on opposite sides of said grooves being gradually tapered to transfer the load to the flange while passing the groove, the chairs having outwardly extending arms adapted to form substantially continuous and-unbroken connections with the surfaces of standard rails, rail sections interconnecting the inner arms of the chairs and forming tread surfaces with the arms thereof which are substantially unbroken and fish plates secured to the webs of the rail sections and the corresponding webs of the arms of the chairs.

3. A railway crossing, comprising a chair for each rail intersectionformed of an inin for receiving the wheel flange and rail 7 treads conforming to standard rail tread proportions, the bottoms of said grooves be' ing substantially unbroken and with a depth to contact with the periphery of the wheel flange when the tread of the wheel is resting at the top of the normal tread portion and the portion of the top of said chair on opposite sides of said grooves being depressed to relieve contactwith the tread while the wheel is traversing the grooves, rail sections interposed between and abutting against corresponding arms of the chairs, the rail sections forming substantially unbroken and continuous extensions of the arms, andfish plate connections bolted to the Webs of the interposed rail sections and the corresponding webs of the chair extensions,

i In testimony whereof I aflix my signature.

LAWVRANCE G. 

